<template>
    <div class="edit-playlist">

      <el-form :model="ruleForm" :rules="rules" ref="ruleForm" label-width="100px" class="demo-ruleForm">
        <el-form-item label="歌单名" prop="name">
          <el-input v-model="ruleForm.name"></el-input>
        </el-form-item>
        <el-form-item label="介绍" prop="description">
          <el-input type="textarea" v-model="ruleForm.description"></el-input>
        </el-form-item>
        <el-form-item label="上传封面">
          <el-upload
            class="avatar-uploader"
            action="https://jsonplaceholder.typicode.com/posts/"
            :show-file-list="false"
            :on-success="handleAvatarSuccess"
            :before-upload="beforeAvatarUpload">
            <img v-if="imageUrl" :src="imageUrl" class="avatar">
            <i v-else class="el-icon-plus avatar-uploader-icon"></i>
          </el-upload>
        </el-form-item>


        <el-form-item>
          <el-button type="primary" @click="submitForm('ruleForm')">确定</el-button>
          <el-button @click="resetForm('ruleForm')">取消</el-button>
        </el-form-item>
      </el-form>


    </div>
</template>

<script>
  export default {
    name: 'editPlaylist',
    data() {
      return {
        imageUrl: '',
        ruleForm: {
          name: "",
          description: ""
        },
        rules: {
          name: [
            { required: true, message: '请输入活动名称', trigger: 'blur' },
            { min: 1, max: 20, message: '长度为 1~20 个字符', trigger: 'blur' }
          ],
          description: [
            { required: false, message: '请填写歌单介绍', trigger: 'blur' }
          ]
        }
      };
    },
    methods: {
      submitForm() {

      },
      handleAvatarSuccess(res, file) {
        this.imageUrl = URL.createObjectURL(file.raw);
      },
      beforeAvatarUpload(file) {
        const isJPG = file.type === 'image/jpeg';
        const isLt2M = file.size / 1024 / 1024 < 2;

        if (!isJPG) {
          this.$message.error('上传图片只能是 JPG 格式!');
        }
        if (!isLt2M) {
          this.$message.error('上传图片大小不能超过 2MB!');
        }
        return isJPG && isLt2M;
      }
    }
  }
</script>

<style scoped>
  .edit-playlist {
    margin-top: 30px;
    margin-right: 30px;
  }

  .avatar-uploader {
    width: 178px;
    height: 178px;
    border: 1px dashed #d9d9d9;
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
  }
  .avatar-uploader:hover {
    border-color: #409EFF;
  }
  .avatar-uploader-icon {
    font-size: 28px;
    color: #8c939d;
    width: 178px;
    height: 178px;
    line-height: 178px;
    text-align: center;
  }
  .avatar {
    width: 178px;
    height: 178px;
    display: block;
  }
</style>
